What do Jiugong, Bagua, Liuhe and Li Si mean respectively?

Jiugong divides the Heavenly Palace into nine equal parts: Gan Palace, Kang Palace, Geng Palace, Gong Zhen Palace, Zhong Palace, Gong Xun Palace, Li Palace, Gong Kun Palace and Dui Palace. At night, the seven obsidians and stars move from the ground to see the sky, and they can know the direction and season. Bagua: A set of symbols in ancient China. With "one" for Yang and "-"for Yin, three such symbols form eight forms, which are called Eight Diagrams. Each six-pointed star represents something. Dry represents the sky, Kun represents the earth, ridge represents water, far represents fire, earthquake represents thunder, roots represent mountains, rafters represent wind, and pairs represent ze. Eight diagrams are matched with each other to get sixty-four hexagrams, which are used to symbolize various natural phenomena and personnel phenomena. In traditional Chinese medicine, gossip refers to eight acupoints around the palm. In the entertainment circle, gossip refers to informal gossip or news, usually the privacy of stars. In terms of tricks, it is called "leaving the sun". There are four such days throughout the year, so it is called "four days away from the sun".